Heeling-machine



T. LUND.

I HEELING MACHINE. APPLICATION FILED c. 30, I915- 1,344, 305. Patented June 22, 1920.

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HEELING MACHINE.

APPLICATION FILED 05c. 30. 1915.

1,344,305. I Patented June 22, 1920.

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Patented June 22, 1920.

4 SHEETS-SHEET 3.

T. LUND.

HEELING MACHINE. APPLICATION FILED 05c. 30, 1915.

Patented June 22, 1920.

4 SHEETSSHEET 4- UNITED STATES OFFICE.

THOMAS LUND, OF BEVERLY, MASSACHUSETTS, ASSIGNOR, BY MESNE ASSIGNMENTS,

TO UNITED SHOE MACHINERY CORPORATION, OF PATERSON, NEW JERSEY, A COR- PORATION OF NEW JERSEY.

HEELING-MACHINE.

- Specification of Letters Patent. Patented June 22 1920 Application filed December 30, 1915. Serial No. 69,473.

Tb all QUZLOHL it may concern. Be it known that I, THOMAS LUNn,'a c1t1- zen of the United States, residing at Bevuse at the present time, mechanism is pro- V Sided for measuring the thickness of the work prior to the application of the final pressure which holds the parts of the work together seiurely while the heel attaching nails are being driven. The general purposes of this measuring mechanism is to adjust the machine automatically preliminarily so that substantially the same amount of pressure will be applied tothe work by the machine regardless of variations in the thickness of the work or in the height of the wood last, when one is used.

Heretofore, the measuring operation has been performed by a yielding actuating. device, such, for example, as a spring, remote from the shoe support, the force being transmitted from the actuating element to the shoe support through a train of mechanism including a wedge or a screw. The wedge or screw in the train of power transmitting connections serves the purpose of effecting the desired measuring.movement and then holding the measuring member in the position to which it has been moved while pressure is subsequently exerted upon the work. The machines referred to have been very successful commercially and a large number of them are in use in shoe factories. It has sometimes occurred, however, that the wedge or screw in the 'rain of connections between.

the actuator and the movable measuring member has slipped under theheavy pressure which it has hadto sustain in the heel attaching operation,- with the result that the work has been injured or spoiled. It has also been possible, by reason of the interposition of considerable mechanism, between the actuator and the measuring member, to operate the final pressure mechanism of the machine so quickly that it would overtake the measuring mechanism and the final pressure would be applied before the work was measured, with the result that the pressure would be insufiicient.

One object of the present invention is to provide simplified measuring mechanism for heeling machines which shall act so quickly that there will be no danger of the final pressure being exerted upon the work before the measuring operation is completed. l l' ith'this object in view, one feature of the invention consists in the provision of an automatic actuating device which shall operate directly upon the measuring member practically instantaneously. This mechanism is so timed that it is thrown into operation prior to the actuation of the final pres- .sure and nailing mechanism and, as a consequence of its instantaneous operation, I danger of the operation of the final pressure mechanism occurring before the measuring operation is completed is eliminated. In the embodiment of the invention herein shown, the jack or work support is hung from one end of abalanced lever upon the 30 opposite end of which a spring operates directly. The spring being initially under ension, acts when released to move the jack exceedingly quickly to measure the work.

Another object of the invention is to pro vide means for insuring that the measurement shall be preserved and that there shall be no possibilityof the parts slipping when the finalpressure is applied. I have secured this result by the provision of means for locking the measuring member positively after it has been moved, preferably to the frame of the. machine. The measuring member is thus held solidly in such a manner that it cannot slip, no matter how great pressure may be exerted upon it. A further improvement in this connection consists in the provision of means for unlockmg the measuring member, timed to operate after the pressure has been released from the work- This feature is of considerable importance, inasmuch asthe unlocking is effected *ith greater ease and with much less wear upon the machine than is the case where it is done while the pressure is still upon the work. It also simplifies the prob-l lem of dcsignmg'a satisfactory locking dc vice which shall be positive in its action.

I have, furthermore, provided means, including a normally straight toggle, for energizing the measuring spring, in combination with means for breaking the toggle to release the spring for the measuring operation, thus simplifying the construction of this part of the machine while securing an improvement in case and certainty of operation as well as strength and durability.

A further object of the invention is to provide simplified and improved mechanism for applying the final pressure to the work, which shall operate with a minimum expenditure of energy and strain upon the working parts. To this end an important feature of the invention consists in the pro vision of mechanism for applying the pressure to the work gradually and releasing the pressure suddenly. In the machine herein illustrated, this feature of the invention is shown as embodied in a movable cam cooperating with acam roll upon one denly out of engagement with the cam roll at the instant when it is desired to release the pressure and being returned to initial position while out of engagement with the cam roll. Friction between the cam and the member operated by it is thus eliminated upon the return stroke of the cam and its operation is both prompt and smooth.

Other novel features of the invention will appear from the following detailed description and the claims appended thereto. It should be understood that the specific embodiment of the invention shown in the ac companying drawings has been selected for the purpose of illustration only, but that the invention may be embodied in various other concrete forms without departure from the spirit and intent of the claims.

In the drawings:

Figure 1 is a view in side elevation of a machine embodying my invention;

Fig. 2 is a longitudinal section of the lower part of the machine from front to rear;

Fig. 3 is a perspective view of a portion of the machine'showing the measuring and final pressure applying mechanisms;

Fig. 4 is a perspective view of the lower portion of the front of the machine showing the final pressure mechanism; and

Fig. 5 is detail of the final pressure mechanism.

The various operating mechanisms of the machine are mounted in and upon a frame 10. In the upper part of the frame a lever 12 is pivoted at 14 and a shoe support or jack 16 depends from the front end of the lever. Vertical adjustment of the jack relative to the lever is provided for by a hand wheel 18. The movable top lever 12 and the jack depending from it constitute the primary means for permitting the measuring operation; the jack with the shoe upon it being moved toward a nail block 20, upon which a heel to be attached to the shoe has previously been placed.

A back rod 22 is pivotally connected at 24: to 'the top lever 12. A heavy compression spring 26, surrounding the back rod, bears at its lower end upon a housing 28 rigidly secured to and, in effect, forming a part of the frame 10, and at its upper end against an adjustable collar 30 upon the back rod. slot 32 in the housing and is secured in the upper end of a slide or block 34: guided for vertical movement in the housing.

The spring 26, when under compression, operates upon the rear end of the to lever 12, tending to move the jack toward t e nail block to effect the measuring operation. The operation of the measuring means is under the control of mechanism which will now be described:

A rod 36 is guided for vertical movement through the slide 31 and its lower end is secured in a vertically slidable block 38. The upper end of the rod 36 has a head slotted at 40 and through the slot passes a pin 42 which is guided in vertical slots at in the housing 28 and forms the upper pivot pin of a toggle 46, 48 (see Figs. 1 and The lower pivot pin of the toggle is a bolt 50 which is threaded into the block 34. The center 52 of the toggle has attached to it one end of a pull spring 54, the other end of which is attached to the frame of the machine. The lower end of the sliding block 38 is pivoted to an eccentric strap 56 upon a pair of eccentrics 58 which are mounted upon the main crank shaft 60 of the machine. The spring 54 tends to keep the toggle 46, d8 in a straight line position as shown in Fig. 3, and it will be apparent that when the eccentric 58 is thrown downwardly as in Fig. 2, it will, through the strap 56, the rod 36, the toggle L6, 48, the sliding block 34, and the back rod22, compress the spring 26 to a condition where it has stored up energy for performing the measuring operation. For releasing the spring, to measure the work, the following mechanism is provided:

A bell crank lever 62 pivoted to the housing 28 at 64: carries at the end of an upwardly extending arm a pivoted dog 66 arranged to engage the projecting end of the center pin 52 of the toggle as is clearly shown in Fig. The dog is pivoted in the end of the arm of the bell crank lever 62 in such a manner as to prevent it from yielding when it is moved rearwardly into engagement with and past the pin 52, but to permit it to yield on the return stroke, so that it may again passthe pin and reach The back rod passes through a its initial position. Aspring 68 connected to the bell crank lever 62 and a tail 7O projecting forwardly from the dog tends normally to hold the dog in the position shown in Fig. 3. A rod 72 connects the bell crank lever with the rear end of a foot treadle 74. With the parts in the position shown in Figs. 1, 2 and 3, a depression of the treadle 74 will move the dog 66 rearwardly until it engages the projecting pin 52, breaking the toggle 46, 48. Since the eccentric 58, which compresses the spring 26, transmits its force through a chain of mechanism including the straightened toggle 46, 48, the breaking of the toggle willrelease the spring, permitting it tomove the top lever 12 and the jack 16, supported thereby, to measure .the work. The amount of pressure to be exerted upon the work in the measuring operation is controlled by adjustment of the collar 30 upon the rod 22.

For the purpose of positively locking the measuring mechanism after the measuring operation has been performed, novel mechanism has been provided which will now be described. Secured to the face of the -sliding block 34 is a ratchet plate 76 which cooperates with a ratchet plate 78 secured to a locking bar 80. The upper end of the locking bar 80 is hung to the housing 28 by a pair of links 82. second pair of links 84, also pivoted at their inner ends to the housing 28, have slots 86 arranged to receive a pin 88 which passes through the lower end of the locking bar 80. The outer ends of the links 84 are constructed and arranged to engage a leaf spring 90 which, for purposes of adjustment, is mounted upon a vertically adjustable bolt 92, held in a stationary bracket 94 secured to the housing 28. A pin 96 passing through the outer ends of the links 84 forms a pivot of a toggle link 98 which is connected by a center pivot pin 100 to a toggle link 102, the inner end of which is pivoted upon the pin 88. The center of this toggle is connected by an adjustable rod 104 to a cam lever 106, the opposite end of which cooperates with a cam 108 upon the crank shaft 60. Normally, when the toggle 98, 102 is straightened the ratchet plates 76 and 78 will be held in engagement with each other by gravity, but the teeth upon said ratchet plates are so formed and directed that the sliding block 34 is permitted to move upwardly when the ratchet plates are in engagement with each other. When this has occurred, however, that is to say, when the measuring operation has been performed, the teeth upon the ratchet plates interlock and positively prevent downward movement of the slides 34 or, in other words, hold the top lever positively against rocking motion and consequently prevent yielding of the jack or work support 16. Since the looking ratchet plate 78 is hung upon the housing 28, this constitutes, in effect, a positive locking of the measuring member to the frame of the machine.

The thickness of the work in the machine having been measured by pressing the shoe upon the jack 16 firmly upon the heel upon the nail block 20, the next step in the normal operation of the heeling machine is to apply the final pressure, which should be considerable in amount. The mechanism for doing this will now be described:

The nail block 20 is supported upon a pair of side rods 110 which carry at their lower ends cam rolls 112. These cam rolls are arranged in cooperative relation to a pair of cam faces 113, upon the cam member 114, which constitute the proximate means for applying the final pressure. The cam member 114 is pivoted at 116 to a rocker member 118 having short faces 119, which are continuations of the cam faces 113, and which is in turn pivotally connected at 120 to a stationary bracket member 122, secured to the frame 10 by a set screw 124, as is clearly shown in Fig. 2. A toggle composed of two members 126 and 128 connects the lower end of the cam member 114 to the rocker member 118 and is normally maintained in the straight line position shown in Fig. 2. When the cam member is in this relation to the rocker member, the portions 113 of its operative faces are concentric with the pivot 120. At the outer ends of these cam faces are depressions 130 which are sufficiently deep so that when the cam is thrown 100 backward, as in Fig. 2, it will not be in engagement with the cam rolls 112. At this time the weight of the nail block and the side rods 110 which carry it is supported by an adjustable screw 132 threaded into a lug 134 upon a cross head 136 fixedly secured to the side rods by the clamping action of bolts 140. The end of the screw 134 bears upon a stationary bracket 142 bolted to the frame 10, and the screwis secured in adjusted position by a checknut 144. The depressions 130 are of such depth that when the cross head 136 is in its lowest position of adjustment, that is to say, when the nut 144 bears directly upon the bracket 142, the cam rolls 112 do not quite touch the cam. Obviously, adjustment of the screw 132 to raise the cross head 136 will move the rolls still farther away from the cam.

The rocker member 118 also cooperates with a member 146, forming a toggle for acdesired to start the machine, depression of the treadle throws the stop dog forward, releasing the stop member 162, and the crank shaft 60 begins to turn 111 the direction indicated by the arrow in Fig. 2. The

crank 15S moves the connecting rod 155 forwardly to straighten the toggle 118, 1 16. The first part of the straightening movement of the toggle, however, is idle, by reason of the lost motion connection heretofore referred to. The forward movement of the member 118 also causes the cam 11 1 carried by it to move forwardly until the cam faces engage the rolls 112, gradually raising the latter, and the side rods and nail block, to exert pressure upon the work. Before the drivers have been moved upwardly any substantial distance, the rolls 112 are riding upon the portions 113 of the cam faces, which merely maintain the pressure upon the work, while the further straightening of the toggle moves the spindle 11S and the drivers upwardly to drive the nails. At the end of the nail driving operation, the connecting rod 155 starts to move downwardly and backwardly and a screw 1T0, adjustably threaded in the connecting rod, engages the projecting tail of the toggle member 126, breaking the toggle 126, 128 and allowing the cam member 114: suddenly to swing downwardly about the pivot 116. This immediately lowers the cam faces 118 and, as the cam swings rearwardly, the faces 119, which are short, move from under the rolls 112, the pressure upon the work thus being very quickly released at the beginning of the return stroke of the connecting rod. At the time when the connecting rod starts upon its return stroke the eccentric 58 is at the upper limit of its throw and so, therefore, is the rod 36. This condition permits the upper pivot 42 of the toggle -16, it? to move upwardly and the toggle is, therefore, straightened by the pull of the spring In the continued return movement of the connecting rod 155, the toggle 118, 116 is completely broken and the drivers retracted while, at the same time, the cam member 11-1, mounted upon the rocker member 118, is retracted until the depressions 180 are under the cam rolls 112. At this time the tail of the toggle member 126 strikes a yielding plunger 172 mounted in the frame 10 which causes the toggle 126, 128 to be straightened and, the parts having arrived at their initial positions, the machine is stopped. In its straight line position, the toggle is actually slightly past center, as indicated in Fig. 2, so that it will tend to remain in that condition when the pressure comes upon the cam. The move ment of the plunger 172 is sufficient to cause the plunger to follow up the tail of the toggle member 126, and prevent the toggle from being broken by jarring, until the pressure comes upon the cam 114, after which there will be no danger of the toggle being broken accidentally. During the return stroke of the connecting rod the eccentric 58 moves toward the position shown in Fig. 2 so that when the machine has stopped, the rod 36 has been drawn down and the spring 26 has been through the said rod and the now straightened toggle 46, 18 again placed under compression ready for the next operation of the machine.

A pull spring 17%, the ends of which are respectively attached to the stationary bracket 1 12 and the cross head 136 is provided for overcoming the inertia of the cross head, side rods and nail block, to cause these parts to descend more quickly than they would under the influence of gravity alone. A treadle spring 176 is also attached to the bracket 142 and serves to elevate the front end of the treadle lever. A safety latch 178 upon the treadle may be turned into the position shown in the drawings to prevent the machine from being started accidentally when adjustments are being made.

The operation of the machine is as follows:

The machine being in the condition shown in Fig. 1 the jack or work support 16 is swung forward and a heel and top lift are inserted in the heel holder 180 and the top lift holder 182, respectively. The heel holder is at this time over the nail block, so that the heel rests upon the nail block, which has previously been loaded with nails. A shoe is placed upon the jack and swung back into the machine with its heel seat in a position over the heel in the heel holder. The hand wheel 18 is adjusted until the shoe and heel are in a proper spaced relation to each other. The treadle T4: is now depressed. The first effect of the treadle depression is to raise the rod 72, operating the bell crank lever to which it is connected, throwing the dog 66 rearwardly into engagement with the pin 52 and breaking the toggle 4e, 48. The breaking of the toggle, which in its straight line position has held the spring'26 under compression, permits the spring to expand and transmit its force through the top lever 12 to the work support 16, pressing the shoe firmly down upon the heel. The pressure exerted upon the work in this so-called measuring operation will be dependent upon the amount of initial compression of the spring 26 which may be regulated by adjustment of the collar 30 and, being measured by the spring, will be substantially uniform regardless of variations in the thickness of the work. By reason of the spring acting directly upon the top lever 12, the measuring operation will be performed very suddenly and before any of the subsequent operations of the machine can be started. During the measuring operation the ratchet plates 76 and 78 are in engagement with each other but, by reason of the way in which their teeth are directed, the block 34 which is secured, through the backrod 22, to the top lever 12 is permitted to move upwardly freely. When, however, it has reached its upper limit of movement, the teeth of the two ratchet plates are interengaged in such a manner as to prevent positively reverse movement of the block 34, and, consequently, to hold the jack positively against upward pressure.

Further depression of the treadlenext brings the rear end of the treadle lever into engagement with the projection 168 upon the rock shaft 166, carrying the clutch stop dog 164, the dog being moved out of engagement with the clutch stop member 162, and the rotation of the crank shaft 60 being started. The crank 156 now moves the connecting rod 155 forwardly, beginning to straighten the toggle 118, 146 and moving the cam 114 forwardly. The first part of the movement of the toggle link 146 being idle, as previously described, the drivers are not moved, but the cam 114 engaging the rolls 112 elevates the side rods 110 and the nail block carried thereby toward the stationary jack to apply the final positive pressure to the work, Any tendency of the block 34 to move downwardly merely causes the teeth on the ratchet plate 78, which is hung upon the links 82, 84, to bite more firmly into the teeth on the ratchet plate 7 6, so that the security of the locking engagement of the teeth on the two plates is increased. In case the horizontal faces of the teeth on the two ratchet plates should not be quite in engagement with each other, the block 34 will move downward the very slight distance necessary to effect solid engagement of the teeth, the spring 90 yielding sufficiently to permit the plate 7 8 to draw into firm contact with the plate 76.

The application of the final pressure is completed and the rolls ride upon the concentric portions 113 of the cam faces when the lost motion between the toggle link 146 and the driver spindle 148 has been taken up and the nail driving movement begun. As the forward movement of the connecting rod 155 continues, the pressure upon the work is maintained and, as the toggle 118, 146 is straightened, the nails are driven to attach the heel to the shoe.

crank shaft continues, the cam 108 acts immediately after the release of the pres-- sure to break the toggle 98, 102, drawing the lower end of the locking member 80 rearwardly until the teeth of the ratchet plate 7 8 are disengaged from the teeth of the ratchet plate 7 6. The teeth of the two plates are heldout of engagement with each other, while the block 34 is drawn down by the eccentric 58 acting through the strap 56, the

block 38, the rod 36, the pin 42 and the now straightened toggle 46, 48. This causes the spring 26 to be again compressed ready for the next operation of the measuring mechanism. As the connecting rod 155 approaches the limit of its return movement, the tail of the toggle member 126 strikes the plunger 172, causing the toggle 126, 128 to be straightened and the cam 114 to be again raised into the position shown in Fig. 2 ready for the next operation of the machine. At the completion of the rotation of the crank shaft, the dog 106 drops off the cam 108, permitting the spring 184 to draw the rod 104' downwardly and straighten the toggle 98, 102. The spring which is relatively stiff as compared with the spring 184, acts as an abutment to support the outer end of the link 84 while the toggle 98, 102 is being straightened. The straightening of the toggle throws the ratchet plates 76, 7 8 into engagement again ready for the next operation of the measuring mechanism.

I Since the movement of the cam 114 and, consequently, the upper limit of the movement of the nail block, is always the same, adjustment of the amount of final pressure is obtained by regulating the screw 132 to determine the lower limit of movement of the nail block, it being obvious that the greater the total amount of the movement of the nail block, the greater will be the amount of final pressure.

Having described the invention, what is claimed as new and desired to be secured by Letters Patent of the United States is:

1. In aheeling machine, the combination of a frame, movable means for exerting measuring pressure upon the work in the machine, independent means for locking said movable means positively to the frame of the mach ne to maintain the pressure, and

means for thereafter applying additional pressure to the work.

2. In a heelmg machine, the combination of a frame, cooperating pressing members, mechanical means for moving one of said members to exert measuring pressure upon the work, independent means for locking said member positively to the frame oi the machine to maintain the pressure, and means for thereafter applying additional, final pressure to thework.

In a heeling machine, the combination oi? a frame, cooperating pressing members,

spring mea for moving one of said members, independent means for locking said member positively to the frame of the machine in the position to which it is moved by the spring means, and means for thereafter applying pressure to the work.

t. A heeling machine having, in combination, oppositely disposed and relatively movable pressing members, a gang of tools aranged to operate upon work held by said members, separate automatic actuating and locking means, one arran ed to move one of the pressing members through a variable distance to subject the work to a uniform pressure regardless of its thickness and the other to lock said member stationary in that position, and power means for thereafter moving the other member toward the first to increase the pressure upon the work.

5. In a heeling machine, the combination of cooperating work pressing members, means for moving one of said members toward the other to measure the work, means for locking said member in the position to which it is moved, means for exerting additional pressure upon the work, means for releasing said additional pressure and inclependent means for unlocking said member constructed and arranged to operate after the last named pressure is released.

(3. In a hceling machine, the combination of supporting means, a work engaging member carried by said means, a spring acting directly upon the supporting means to move said member to exert measuring pressure upon the work, a locking member operating to lock the supporting means positively in measuring position, means for applying ad ditional, final pressure to the work, means for operating said locking member to unlock the supporting means and means for thereafter energizing the spring.

7. In a heeling machine, the combination of work measuring means, including a spring, means, including a toggle, for energizing the spring, the construction and arrangement being such that the tog le is straight when the spring is energized; and means for breaking the toggle to permit operation of the spring.

8. In a heeling machine, the combination of a measuring slide, means for actuating the slide, a cooperating positive locking member, and links upon which the locking member is hung in cooperative relation to the slide.

9. I11 a heeling machine, the combination of a slide, a cooperating locking member, swinging links upon which the locking member is hung in cooperative relation to the slide, and a toggle connecting the locking member to one of the links, the construction and arrangement being such that breaking the toggle will disengage the locking member from the slide.

10. In a heeling machine, the combination of heel attaching mechanism, measuring mechanism, means for locking the measuring mechanism against movement, a toggle controlling the locking means, and automatic means for operating the toggle to unlock the measuring means after the operation of the heel attaching mechanism.

11. In a heeling machine, the coml; i11ation of a measuring member, a work support carried by the measuring member, automatic actuating means acting directly upon the measuring member practically instantaneously, a nail block opposed to the work support, and final pressure ll'lQClliUllSll'l operating to move the nail block toward the work support in timed relation to the action of the measuring member.

12. In a heeling machine, the combination of a measuring member, a work support carried by said member, a spring, normally under tension, acting directly upon the measuring member, a nail block opposed to the work support, final pressure mechanism operating to move the nail block toward the work support, and means for releasing the spring prior to the operation of the final pressure mechanism.

' 13. In a heeling machine, the combina tion of a lever, a work support carried by the lever, a nail block opposed to the work support, an energy storing device acting directly and automatically upon the lever to measure the work practically instantaneously, and final pressure mechanism operating to move the nail block toward the work support to apply pressure to the work.

14. In a heeling machine, the combination of a work support, an opposed nail block, a measuring member carrying one of the opposed elements, automatic actuating means acting directly upon the measuring member to measure the work n actically instantaneously, and final pressure mechanism operating to move the other of the opposed elements'toward the first in, timed relation to the action of the measuring member.

15. In aheelingmachine, the combination a oi": linal pressure mechanism, means for actuating said mechanism, measuring mechanism so constructed and arranged as to insure its operation before the final pressure is applied, and toggle controlled actuating means for the measuring mechanism separate from the means for actuating the final pressure mechanism.

17. In a heeling machine, the combination of toggle controlled measuring mechanism, constructed and arranged to initiate a measuring operation by breaking the toggle, and means for automatically straightening the toggle prior to the next measuring operation.

18. In a heeling machine, the combination of toggle controlled measuring mechanism, constructed and arranged to initiate the measuring operation by breaking the toggle, and means for straightening the toggle prior to the completion of a single cycle of operation of the machine.

19. In pressure mechanism for heeling machines, the combination of means for grad- 'ually applying pressure to the Work, and means for suddenly releasing the pressure.

20. In pressure mechanism for heeling machines, the combination of a pressure member, and an oscillatory cam for moving the pressure member constructed and arranged to move in one direction in operative relation to the pressure member and to move in the opposite direction out of operative relation to the said member.

2L In pressure mechanism for heeling machines, a collapsible cam, a pressure member, means for causing the cam to move in one direction in operative relation to the pressure member, and means for collapsing the cam and moving it in the opposite direction out of operative relation'to the pressure member.

In a heeling machine, a cam having relatively movable parts, in combination with a toggle so connecting the parts that breaking the toggle causes the cam to colla-pse.

23. In pressure mechanism for heeling machines, a pressure member, a cam having an operating face for moving the pressure mem ber, the cam being mounted for pivotal movement about a plurality of centers, means for moving the cam about one center to apply pressure to the Work, and means for moving the cam about another center to release the pressure.

24. In pressure mechanism-for heeling machines, a pressure member, a cam having an operating face for mowing the pressure member, the cam being mounted for pivotal movement about a plurality of centers, means for advancing the cam about one center to apply pressure to the Work, and means for retracting the cam about a plurality of centers to release the pressure and return the cam to initial position.

25. In pressure mechanism for heeling machines, the combination of a pressure member, a pressure member actuating cam having a plurality of relatively movable parts connected by a toggle, means for straightening the toggle prior to the operative movement of the cam, and means for breaking the toggle at the beginning of the return movement of the cam.

26. In pressure mechanism for heeling machines, a pressure member, an oscillatory collapsible actuating cam'for the pressure member, a crank for oscillating the cam, a connecting rod connecting the crank and cam, and means upon the connecting rod for col- -lapsing the cam upon its return stroke.

27. In pressuremechanism for heeling machines, the combination of a pressure memher. a cam for actuating the pressure member, and means for imparting a forward operative stroke to the cam in one path, to apply pressure to the work, and a return stroke in another path, to release the pressure suddenly.

9.8. In pressure mechanism for heeling machines, the combination of a pressure member, a cam for actuating the pressure member, and means for moving the cam forwardly, to actuate the pressure member, and then moving it bodily away from the pressure member, to release said member suddenly.

In testimony whereof I have signed my name to this specification.

THOMAS LUND. 

